I have completed a 30day evaluation of five talking scientific calculators and have constructed a chart comparing the various features of these calculators and listing possible vendors if you choose to make a purchase. No one calculator has everything for all people. You will need to assess your needs or those of your student and make your choice based on your unique situation. In the near future I will be adding my own personal comments and those of my students. In addition, I hope to add comments from others. I encourage you to write me with your comments (whether good or bad) so that they may be shared. You make the choice of whether you wish to be named or remain anonymous. As new products become available, I will try to evaluate those as well and make additions to the chart.
At this time I would like to express my thanks to Maxi Aids, Independent Living Aids, Inc. and Orbit Research for graciously loaning me their products for this evaluation.
There are also several software programs available (often free and supplied with various hardware products). Several years ago I had three students simultaneously using the scientific calculator (with earphones) on their respective Keynotes for a Trigonometry class, and it met our limited needs. As a math teacher and Nemeth Code user, I want my students to be able to tactually "see" their work, so I was very pleased with the addition of a refreshable braille display to various pieces of hardware. (See: http://www.blazie.co.uk/ or http://www.humanware.com/Text/E/E1/E1.html) My students have been using the Braille Lite, and we really like its compactness and quietness, especially for mainstream classes. Blazie has extended the capabilities of its scientific calculator to enable it to produce graphics on a braille printer. (See: "BRAILLE 'n SPEAKUNLOCKING DOORS TO MATH FOR BLIND STUDENTS.")
The latest technological need for the blind is a talking graphing calculator with the sophistication of the TI8? series. Graphing calculators are now required as a part of an end of course test in Algebra I in Texas, and they are often a requirement in advanced mathematics classrooms across the U.S.
 Download Scientific Calculators Features Page 1.rtf (18k) and Scientific Calculators Features Page 2.rtf (20k)
CAPTEK DIGIVOICE Scientific Calculator #1420  CAPTEK DIGIVOICE Statistical Calculator #1423  CAPTEK DIGIVOICE Financial Calculator #1425  

Physical Description  25 keys 4" by 8" by 3" height in rear 12 round keys; 13 square keys visual display 
Not actually evaluated; described as similar to the scientific calculator with additional keys added for the statistical functions. (closely resembles model #1425)  30 keys 4" by 8" by 3" height in rear 12 round keys, 18 square keys visual display 
Voice response for all keys of the keyboard  Yes  Yes  Yes 
Option for partly voiced  Yes (announces operations and answers only) 
Yes (announces operations and answers only) 
Yes (announces operations and answers only) 
Help or learn function which allows the user to hear a key’s function without disturbing a calculation in progress  Yes (help function turns off after announcing one key’s function) 
Yes (help function turns off after announcing one key’s function) 
Yes (help function turns off after announcing one key’s function) 
Voice Languages  English  English  English 
On/Off  Must turn on by pressing ON. Turns off three minutes after the last key press or may be turned off by pressing Shift 1, ON 
Must turn on by pressing ON. Turns off three minutes after the last key press or may be turned off by pressing Shift 1, ON 
Must turn on by pressing ON. Turns off three minutes after the last key press or may be turned off by pressing Shift 1, ON 
Ability to hear the current active number at any time.  Yes  Yes  Yes 
Volume Control  9 levels  9 levels  9 levels 
Distinctly marked keys for easy identification  5, decimal, and X  5, decimal, and X  5, decimal, and X 
Most/all keys have _____ functions  Three (The shift keys, four basic math functions, zero, decimal, and equals have only one function each.) 
Information not available  Three (The shift keys, four basic math functions, and zero have only one function each.) 
Memory Positions  Ten  Ten  Ten 
Accessories 



Basic Keys: decimal, =, 09 
Yes  Yes  Yes 
Basic Function Keys: +, , times, divide 
Yes  Yes  Yes 
Parentheses ( )  Yes  Yes  Yes 
Backspace Key  No  No  No 
Clear last entry Key  Yes  Yes  Yes 
+/Key  Yes  Yes  Yes 
Scientific Notation  Yes  Yes  Yes 
Engineering Notation  No  No  No 
Fix Display Decimal Key  Yes  Yes  Yes 
Square Root Key  Yes  Yes  Yes 
Cube Root Key  No  No  No 
x^{2} Key  Yes  Yes  Yes 
1/x Key  Yes  Yes  Yes 
% Key  Yes  Yes  Yes 
Degrees Key  Yes  Yes  Yes 
Radians Key  Yes  Yes  Yes 
Grads Key  No  No  No 
Sin Key  Yes  Yes  Yes 
Cos Key  Yes  Yes  Yes 
Tan Key  Yes  Yes  Yes 
Sin^{1} (arc sin) Key  Yes  Yes  Yes 
Cos^{1 }(arc cos) Key  Yes  Yes  Yes 
Tan^{1} (arc tan) Key  Yes  Yes  Yes 
Pi Key  Yes  Yes  Yes 
e Key  No  No  No 
Ln Key  Yes  Yes  Yes 
Log Key  Yes  Yes  Yes 
e^{x} Key  Yes  Yes  Yes 
10^{x} Key  Yes  Yes  Yes 
x^{y} Key  Yes  Yes  Yes 
Universal Root Key  No  No  No 
n! Key  Yes  Yes  Yes 
Hyperbolic Sin Key  No  No  No 
Hyperbolic Cos Key  No  No  No 
Hyperbolic Tan Key  No  No  No 
Fraction entry, operation, and conversion to decimal keys  No  No  No 
Fahrenheit/Celsius conversion keys  Yes  Yes  Yes 
Degree, minute, second/decimal degree conversion keys  No  No  No 
Polar/Rectangular conversion keys  No  No  No 
Special Functions for Mortgage, Real Estate and Business  No  No  Yes (Amortization, interest, dates, monthly payment, x/y change, future value, mortgage computations) 
Special Functions for Statistics  No  Yes (Summation, mean, x/y change, standard deviation, probability, combination, permutation, y intercept, slope) 
No 
Calculations and conversions in hexadecimal, octal, and binary number bases  No  No  No 
Boolean logic operations, computer math keys  No  No  No 
Time, Alarm, and Chronometer Functions  No  No  No 
Print on/off Key  No  No  No 
Manufacturer  CAPTEK Custom Applied Technology 104 Lincoln Highway Berwyn, PA 19312 Phone: 6102962348 FAX: 6102960488 Technical Hot Line: 18008887401 
CAPTEK Custom Applied Technology 104 Lincoln Highway Berwyn, PA 19312 Phone: 6102962348 FAX: 6102960488 Technical Hot Line: 18008887401 
CAPTEK Custom Applied Technology 104 Lincoln Highway Berwyn, PA 19312 Phone: 6102962348 FAX: 6102960488 Technical Hot Line: 18008887401 
Possible Vendors:  Maxi Aids & Appliances for Independent Living 42 Executive Blvd. P.O. Box 3209 Farmingdale, NY 11735 Phone: 8005226294 FAX: 5167520689 Email: Website: http://www.maxiaids.com $489.95 
Maxi Aids & Appliances for Independent Living 42 Executive Blvd. P.O. Box 3209 Farmingdale, NY 11735 Phone: 8005226294 FAX: 5167520689 Email: Website: http://www.maxiaids.com $539.95 
Maxi Aids & Appliances for Independent Living 42 Executive Blvd. P.O. Box 3209 Farmingdale, NY 11735 Phone: 8005226294 FAX: 5167520689 Email: Website: http://www.maxiaids.com $539.95 
Science Products Box 888 Southeastern, PA 19399 Phone: 8008887400 $495.00 
Science Products Box 888 Southeastern, PA 19399 Phone: 8008887400 $545.00 
Science Products Box 888 Southeastern, PA 19399 Phone: 8008887400 $545.00 

LS&S Group, Inc. P.O. Box 673 Northbrook, IL 60065 Phone: 8004684789 FAX: 8474981482 Email: Website: http://www.lssgroup.com/ $495.00 
LS&S Group, Inc. P.O. Box 673 Northbrook, IL 60065 Phone: 8004684789 FAX: 8474981482 Email: Website: http://www.lssgroup.com/ $545.00 
LS&S Group, Inc. P.O. Box 673 Northbrook, IL 60065 Phone: 8004684789 FAX: 8474981482 Email: Website: http://www.lssgroup.com/ $545.00 

Carolyn's Catalog P.O. Box 14577 Bradenton, FL 342804577 Phone: 8006482266 Fax: 9417395503 Email: Website: http://www.carolynscatalog.com/ $495.00 
Carolyn's Catalog P.O. Box 14577 Bradenton, FL 342804577 Phone: 8006482266 Fax: 9417395503 Email: Website: http://www.carolynscatalog.com/ $595.00 
Carolyn's Catalog P.O. Box 14577 Bradenton, FL 342804577 Phone: 8006482266 Fax: 9417395503 Email: Website: http://www.carolynscatalog.com/ $595.00 
AUDIOCALC Scientific Calculator EC9056  RNIB Talking Scientific Calculator DE24 (USA DE26)  ORION TI34 Talking Scientific Calculator  

Physical Description  28 keys 4" by 6" by 1.5" height keyboard with a completely sealed raised membrane with mechanical depression visual display 
40 keys 7.5" by 5.5" by 1.75" height sloping desktop case with a purposedesigned raised tactile keypad membrane no visual display RS232 output port 
42 keys 2.9" by 5.8" by 1.5" height keyboard with large, tactile, functionally zoned keys visual display and functionality are the same as regular TI34 
Voice response for all keys of the keyboard  Yes  Yes  Yes 
Option for partly voiced  No  Yes (Quiet/Verbose mode; results are spoken after pressing equals/also speaks the intermittent results) 
Yes (Quiet/Verbose/Answer mode, final results and some intermittent results are spoken after pressing equals/also speaks the contents of the screen/results are spoken as soon as an active key is pressed) (Additional feature speech modes include: Simple/Descriptive; Special Symbols Spoken/Not Spoken; Buffered/Flush.) 
Help or learn function which allows the user to hear a key’s function without disturbing a calculation in progress  Yes (key toggles between normal and learn mode) 
Yes (key toggles between normal and learn mode) 
Yes (button toggles between normal and learn mode) 
Voice Languages  English, French, Spanish  English  English 
On/Off  There is no on/off switch. Automatic start and stop As soon as a key is pressed, the calculator is operational and it stops automatically at the end of the voice process. 
On/off switch located at back of unit. After 3 to 4 minutes without a keystroke, the device will beep once. 20 seconds later a double beep will occur. 10 seconds further and the device will beep 3 times and the calculator switches off 5 seconds later. 
To switch ON, press the AC/ON key To turn OFF, press the REPEAT/OFF button (located on the righthand side) for more than 2 seconds. After a preselected (by you) time period without a keystroke, the device will beep 30 seconds before shutdown, and again 15 seconds later. 
Ability to hear the current active number at any time.  Yes  Yes (also includes ability to hear the last intermittent result and all calculated decimal places irrespective of the current decimal place fix value) 
Yes (also includes ability to hear special indicators that may be displayed on the display: M, E, 2^{nd}, HYP, BIN, OCT, HEX, STAT, DEG, RAD, GRAD, ( )) 
Volume Control  10 levels  Knob located at back of unit  Thumbwheel on left side of unit. 
Distinctly marked keys for easy identification  =, 5, and Help  5  A set of dots is provided with the calculator so that users can affix them wherever they find most useful. 
Most/all keys have _____ functions  Two  Two (However, some have one; others have three.) 
Two (However, some have one, others have three.) 
Memory Positions  Ten  One (Uses memory plus, minus, clear, replace, recall, and swap functions and fully implements order of operations: Parentheses, multiplication, division, addition, subtraction) 
One (Uses memory store, recall, exchange, and sum functions and fully implements order of operations: Parentheses, multiplication, division, addition, subtraction) 
Accessories  NiCad 8.4 volt battery 9V AC to DC adapter earphone case print manual instruction cassette 1yr warranty 
4 AA NiCd batteries charger headphones RS232 serial cable and 9pin to 25pin adapter case with shoulder strap print instructions instruction cassette 3.5" help disk for general calculator, and connection to a computer or printer instructions braille available on request 1yr warranty 
Builtin rechargeable battery which must be replaced by Orbit Research (battery should last at least through 500 charge and discharge cycles) 9V AC to DC adapter (battery charger) earphone sliding, impact resistant plastic cover print manual instruction cassette 1yr warranty 
Basic Keys: decimal, =, 09 
Yes  Yes  Yes 
Basic Function Keys: +, , times, divide 
Yes  Yes  Yes 
Parentheses ( )  Yes  Yes  Yes 
Backspace Key  Yes This function allows the user to backspace during construction, and erase any digit in a constituted number, starting with the last digit entered. 
No  Yes This function allows the user to backspace during construction, and erase any digit in a constituted number, starting with the last digit entered. 
Clear last entry Key  Yes  Yes  Yes 
+/Key  Yes  Yes  Yes 
Scientific Notation  Yes  Yes  Yes 
Engineering Notation  No  No  Yes 
Fix Display Decimal Key  Yes  Yes  Yes 
Square Root Key  Yes  Yes  Yes 
Cube Root Key  No  No  Yes 
x^{2} Key  Yes  Yes  Yes 
1/x Key  Yes  Yes  Yes 
% Key  Yes  No  Yes 
Degrees Key  Yes  Yes  Yes 
Radians Key  Yes  Yes  Yes 
Grads Key  No  No  Yes 
Sin Key  Yes  Yes  Yes 
Cos Key  Yes  Yes  Yes 
Tan Key  Yes  Yes  Yes 
Sin^{1} (arc sin) Key  Yes  Yes  Yes 
Cos^{1 }(arc cos) Key  Yes  Yes  Yes 
Tan^{1} (arc tan) Key  Yes  Yes  Yes 
Pi Key  Yes  Yes  Yes 
e Key  No  Yes  No 
Ln Key  Yes  Yes  Yes 
Log Key  Yes  Yes  Yes 
e^{x} Key  Yes  Yes  Yes 
10^{x} Key  Yes  Yes  Yes 
x^{y} Key  Yes  Yes  Yes 
Universal Root Key  No  No  Yes 
n! Key  No  Yes  Yes 
Hyperbolic Sin Key  No  Yes  Yes 
Hyperbolic Cos Key  No  Yes  Yes 
Hyperbolic Tan Key  No  Yes  Yes 
Fraction entry, operation and conversion to decimal keys  No  No  Yes 
Fahrenheit/Celsius conversion keys  No  No  No 
Degree, minute, second/decimal degree conversion keys  No  No  Yes 
Polar/Rectangular conversion keys  No  No  Yes 
Special Functions for Mortgage, Real Estate and Business  No  No  No 
Special Functions for Statistics  No  Yes (Summation, mean, standard deviation, combination, permutation, variation, statistics plus, minus, and clear keys) 
Yes (Data entry and removal, mean, population standard deviation, sample standard deviation, sum of data values, sum of squares, number of data values, and clear keys) 
Calculations and conversions in hexadecimal, octal, and binary number bases  No  No  Yes (including NEG key and AF keys for hexadecimal digits) 
Boolean logic operations, computer math keys  No  No  Yes (NOT, AND, OR, XOR, XNOR keys) 
Time, Alarm, and Chronometer Functions  Yes (Includes ability to program ten alarms, each of which can be momentary or repetitive and two modes of timekeeping) 
No  No 
Print on/off Key  No  Yes (This key turns the RS232 serial port on or off.) 
No 
Manufacturer  Institut de Readaptation en Deficience Physique de Quebec Site LouisHebert 525 Boulevard Hamel Est Aile J Quebec G1M 2S8 CANADA Phone: 4185296991 FAX: 4185291710 
RNIB (Royal National Institute for the Blind) P.O. Box 173 Peterborough PE2 6WS United Kingdom Phone: +44 (0) 345 023153 
Orbit Research 3422 Old Capitol Trail Suite 585 Wilmington, DE 19808 Phone: 88860ORBIT FAX: 8886067248 Email: Website: http://www.orbitresearch.com 
Possible Vendors:  Maxi Aids & Appliances for Independent Living 42 Executive Blvd. P.O. Box 3209 Farmingdale, NY 11735 Phone: 8005226294 FAX: 5167520689 Email: Website: http://www.maxiaids.com $539.95 
Independent Living Aids, Inc. 27 East Mall Plainview, NY 118034404 Phone: 800572118 FAX: 5167523135 Email: Website: http://www.independentliving.com $425.00 
Orbit Research 3422 Old Capitol Trail Suite 585 Wilmington, DE 19808 Phone: 88860ORBIT FAX: 8886067248 Email: Website: http://www.orbitresearch.com $199.00 
LS&S Group, Inc. P.O. Box 673 Northbrook, IL 60065 Phone: 8004684789, FAX: 8474981482 Email: Website: http://www.lssgroup.com/ $539.95 

Carolyn's Catalog P.O. Box 14577 Bradenton, FL 342804577 Phone: 8006482266, Fax: 9417395503 Email: Website: http://www.carolynscatalog.com/ $575.00 

Blazie Engineering 1095 E. Jarrettsville Rd. Forest Hill, MD 21050 Phone: 4108939333 FAX: 4108365040 email: Website: http://www.blazie.co.uk/ $659.00 